In TinyUmbrella there is an option in the "Advanced" tab to "Set Hosts to Cydia on Exit" check this box,This will allow iTunes to talk to Cydia's cache server rather than Apples cache server.

Put the iPhone/iPad/iPod into DFU mode by turning the phone off and then holding down the sleep and power button for 10 seconds, then release the power button but hold onto the home button until iTunes tells you that the device is now in recover/DFU mode

Try to restore.

3rd Method:

Quit iTunes

Locate your hosts file, in Mac OS X this is /etc/hosts and in Windows this is c:\windows\system32\drivers\etc\hosts

Open the hosts file with Administrator privileges

Add the following lines to the very bottom of the hosts file:

74.208.105.171 gs.apple.com

Connect your iPhone to the computer

Launch iTunes

Put the iPhone/iPad/iPod into DFU mode by turning the phone off and then holding down the sleep and power button for 10 seconds, then release the power button but hold onto the home button until iTunes tells you that the device is now in recover/DFU mode

Use the iTunes Restore feature as usual with the iOS device

Once your iOS Restore is finished, remove the “74.208.105.171 gs.apple.com” line from your hosts file again so that iTunes can properly update as usual. If you need them, you can get iPhone firmware, iPad firmware, and iPod touch firmware directly from Apple.
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